Beautiful Egyptian Blue Flat Coin Agate Beads - Large 20mmPrice is for 16 inch string of these blue agate beads. Each bead measure 20mm x 3mm with 4mm hole in the middle. There are about 20 beads in a string. All is drilled ready to thread same as the picture. Agate is one of the most common bead beaders use because it is readily available in an abundance of styles and shapes. What is agate? Agate is a variety of micro crystalline quartz that forms in layers and many colours and texture, by filling a cavity